Rare citrine geode with long calcite crystals and a scepter urchin

A rare citrine geode from Brazil with long calcite crystals and a scepter hedgehog as the highlight of the internal composition.

Citrine, a yellow variety of quartz, crystallizes in volcanic geodes. Calcite (CaCO₃) grows as a secondary phase on already completed quartz growth surfaces.

The scepter hedgehog is a special form of quartz growth. A young crystal grows perpendicularly or obliquely onto an older crystal, forming a hedgehog-like multi-point configuration.

Brazilian geodes from Rio Grande do Sul provide this material. Such three-phase specimens with a citrine matrix, calcite overgrowths, and scepter quartz aggregates document a complex mineralization history.

A Brazilian collector's item with textbook three-phase genesis, gallery format, and clearly visible growth stratigraphy.